Revert 229524 "Revert 229521 "Revert 229507 "aura: Allow creating content_shell...""

Breaks blink waterfall due to TOOLKIT_VIEWS not defined there.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229525 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229525